161245312 has 32 divisors (see below), whose sum is σ = 322692300. Its totient is φ = 80256000.

The previous prime is 161245309. The next prime is 161245319. The reversal of 161245312 is 213542161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 112021056 + 49224256 = 10584^2 + 7016^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-3 number, since 3×161245312³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (161245319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26562 + ... + 32062.

Almost surely, 2^161245312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161245312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161346150).

161245312 is an abundant number, since it is smaller than the sum of its proper divisors (161446988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161245312 is an equidigital number, since it uses as much as digits as its factorization.

161245312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5744 (or 5732 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 161245312 is about 12698.2405080389. The cubic root of 161245312 is about 544.2883419498.

Adding to 161245312 its reverse (213542161), we get a palindrome (374787473).

The spelling of 161245312 in words is "one hundred sixty-one million, two hundred forty-five thousand, three hundred twelve".